A Neuroprosthesis for Prolonged Standing After SCI Using Multi-Contact Peripheral Nerve Electrodes

Inclusion Criteria: * Skeletal maturity (age 21 and above), and ability to sign informed consent * Paralysis resulting from neurological disorder such as low cervical/thoracic spinal cord injuries (C6-T12) * Time post injury greater than six months to assure neurological and emotional stability * Innervated and excitable lower extremity and lumbar trunk musculature * Absence of acute or chronic psychological problems or chemical dependency * Range of motion within normal limits, (full extension at the hip and knee, and ability to attain a neutral ankle position) * Controlled spasticity and absence of hip flexion and adduction spasms * Appropriate body habitus (BMI within normal range) * Adequate social support and stability * Willingness to comply with follow-up procedures. * Full coverage of the acetabulum and minimal knee and ankle laxity Exclusion Criteria: * History of vestibular dysfunction, balance problems or spontaneous falls. * Acute orthopaedic problems: severe scoliosis or joint dislocation, severe osteoporosis. * Acute medical complication: cardiac abnormalities, skin breakdowns, uncontrolled seizures, or immunological, pulmonary/ renal/ circulatory compromise, auto-immune deficiencies, sepsis, active infection, dental caries. * Diabetes * Non-English speaking subjects * Pregnancy